.activity-heading { display: grid; gap: var(--space-2); }
.activity-heading > a { width: fit-content; }
.activity-kind, .activity-kind > div { display: flex; align-items: center; gap: var(--space-2); }
.activity-kind { justify-content: flex-end; }
.activity-kind [aria-pressed="true"] { background: var(--primary); color: var(--primary-foreground); }
.activity-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 0; margin: 0; gap: var(--space-3); }
.activity-flow li { position: relative; min-width: 0; }
.activity-flow li + li::before { content: '→'; position: absolute; left: calc(-1 * var(--space-3)); top: var(--space-4); color: var(--muted-foreground); }
.activity-flow button { display: flex; gap: var(--space-2); width: 100%; height: 100%; align-items: flex-start; padding: var(--space-3); border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--background); color: var(--foreground); text-align: left; font: inherit; font-size: var(--fs-sm); cursor: pointer; }
.activity-flow button[aria-current="step"] { border-color: var(--primary); background: var(--muted); }
.activity-flow button:disabled { cursor: default; }
.activity-flow button small { display: block; margin-top: var(--space-1); color: var(--muted-foreground); font-size: var(--fs-xs); }
.activity-step-number { flex-shrink: 0; font-variant-numeric: tabular-nums; color: var(--foreground); }
.activity-workspace { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.45fr); gap: var(--space-8); border-block: 1px solid var(--border); padding-block: var(--space-6); }
.activity-detail { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); min-width: 0; }
.activity-detail h2, .activity-detail p { margin: 0; }
.activity-detail ol { padding-left: var(--space-5); margin: var(--space-2) 0; font-size: var(--fs-sm); }
.activity-detail li + li { margin-top: var(--space-3); }
.activity-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }
#activityNext { margin-top: var(--space-2); }
.activity-visual { min-width: 0; }
.activity-scene { margin: 0; background: var(--muted); border-radius: var(--radius-md); padding: var(--space-3); }
.activity-scene svg { display: block; width: 100%; max-height: 270px; }
.activity-scene figcaption { text-align: center; color: var(--foreground); }
.activity-scene-road { fill: none; stroke: var(--border); stroke-width: 15; }
.activity-scene-ground { fill: var(--background); stroke: var(--border); stroke-width: 1; }
.activity-scene-boundary { fill: none; stroke: var(--primary); stroke-width: 2; stroke-dasharray: 6 4; }
.activity-building-front { fill: var(--primary); }
.activity-building-side { fill: color-mix(in srgb, var(--primary) 75%, var(--foreground)); }
.activity-building-roof { fill: color-mix(in srgb, var(--primary) 65%, var(--background)); }
.activity-building-window { fill: var(--background); }
.activity-building-door { fill: var(--foreground); }
.activity-scene-record rect { fill: var(--background); stroke: var(--primary); }
.activity-scene-record text { fill: var(--foreground); font: 13px var(--font-sans-locale); }
.activity-scene-record path { fill: none; stroke: var(--primary); stroke-width: 2; }
.activity-scene-pin path { fill: var(--primary); }
.activity-scene-pin circle { fill: var(--primary-foreground); }
.activity-scene[data-stage="0"] .activity-scene-building, .activity-scene[data-stage="0"] .activity-scene-record, .activity-scene[data-stage="1"] .activity-scene-record, .activity-scene[data-approved="false"] .activity-scene-pin { display: none; }
.activity-outcomes { border-left: 1px solid var(--border); margin: var(--space-4) 0 0 var(--space-4); }
.activity-outcome { display: flex; gap: var(--space-3); padding: var(--space-3); border-bottom: 1px solid var(--border); }
.activity-outcome:last-child { border-bottom: 0; }
.activity-outcome h3 { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-1); }
.activity-outcome-arrow { color: var(--muted-foreground); }
.activity-outcome[data-active="true"] .activity-outcome-arrow { color: var(--primary); }
.activity-outcome strong { font-variant-numeric: tabular-nums; }
.activity-example-note { margin-top: calc(-1 * var(--space-3)); }
.activity-reference { border-top: 1px solid var(--border); padding-top: var(--space-4); }
.activity-reference summary { cursor: pointer; font-size: var(--fs-sm); }
.activity-reference > div { display: grid; gap: var(--space-3); margin-top: var(--space-4); }
.activity-reference-links { display: flex; flex-wrap: wrap; gap: var(--space-4); font-size: var(--fs-sm); }
.activity-no-script { display: grid; gap: var(--space-6); }
.activity-no-script ol { margin-block: var(--space-3); padding-left: var(--space-5); }
.activity-page [hidden] { display: none !important; }
@media (max-width: 767px) {
  .activity-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-2); }
  .activity-flow li + li::before { content: none; }
  .activity-flow button { padding: var(--space-3) var(--space-2); }
  .activity-workspace { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .activity-kind { justify-content: flex-start; }
  .activity-heading h1 { font-size: var(--fs-h1); }
  .activity-scene svg { max-height: 230px; }
}